234 	unsigned int writers = READ_ONCE(pipe->writers);  in pipe_readable()  local
236 	return !pipe_empty(idx.head, idx.tail) || !writers;  in pipe_readable()
371 		if (!pipe->writers)  in anon_pipe_read()
690 		if (!pipe->writers && filp->f_pipe != pipe->w_counter)  in pipe_poll()
732 		pipe->writers--;  in pipe_release()
735 	if (!pipe->readers != !pipe->writers) {  in pipe_release()
901 	pipe->readers = pipe->writers = 1;  in get_pipe_inode()
1167 		if (!is_pipe && !pipe->writers) {  in fifo_open()
1190 		if (!pipe->writers++)  in fifo_open()
1208 		pipe->writers++;  in fifo_open()
1211 		if (pipe->readers == 1 || pipe->writers == 1)  in fifo_open()
1231 	if (!--pipe->writers)  in fifo_open()